Why do guys cut lines through their eyebrows..?

Smilie-xo
I just saw somebody downtown today with a line shaved (or waxed or tweezed) through his eyebrow... I mentioned it to my boyfriend and he told me it was actually pretty common but he didn't know why so I was wondering if any of you did? Have any of the guys on here done this? Is it only guys or do girls do this too?
Why do guys cut lines through their eyebrows..?
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